Ask both engines the same local-business question and the answers may sound similar. The source lists are not.
We matched 1,500 queries across 50 metros and 10 service categories. The average overlap between Gemini’s and ChatGPT’s cited domains was 8.3%. When both engines named a recognizable business, they chose the same business first just 4.9% of the time.
1,500 MATCHED QUERIES
8.3% AVERAGE DOMAIN OVERLAP
4.9% SAME TOP BUSINESS
Sept. 2026 last update
Many more stats here : https://www.steadydemand.com/ai-citation-ledger-gemini-vs-chatgpt/
Source: r/AIStatistics · by /u/Shardoran